Be smart

Roman Vojtěch | July 6, 2010 | F3B, Workshop | 0 |

Last year at F3B World’s my friend made picture of Japanese guy using small greaser tank to oil line. I found this idea as very clever and used it in my own way. I found following pros in this way to grease line:

  • ecologic+economic
  • clean (I hate all that sprayed siliconized stuff+staff, silicon everywhere)
  • tiny
  • cheap
  • automatic (before going for parachute, just hang on greaser and that’s all, after comming back deploy greaser)
  • AND IT’S WORKING!

I don’t think few pictures bellow needs some comments. Maybe only one, I use few drops of pure silicon, in commercial spray there is max. about 5% of silicon.

12mm flaps on your start? Are you sure?

Roman Vojtěch | June 4, 2010 | F3B | 0 |

Today with our composite toys we have many tools how to set up proper deflections on all controllable surfaces (flaps, ailerons, elevator, rudder etc.). We play with speed polars at computers with sophisticated simulation software, we cope with secret setups from top pilots etc. We play with millimeters, on elevator perhaps with tenths of millimeters.

I was just curious what’s going on for example with trailing edge of standard F3B model at launch phase. For me it was big surprise to find out that if you setup e.g. 12mm deflection, just after model release from hand you can have there only 50% of expected setup.

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LOLO5 under test

Roman Vojtěch | May 31, 2010 | Others | 0 |

Thanks to my good friends I had chance to measure my LOLO5 logger in calibrated pressure chamber. We were “flying” more than 60 minutes up to 4000meters ( more than 13.000 ft). Although LOLO5 was designed for RC model users i.e. approx. up to 1000meters (3.300 ft), error in 4000meters was 6,4% (254m/833ft). Bellow you can see altitude log, deviation table and measuring devices configuration.

During measurement and changing flying level I had also chance to check accuracy and sensitivity of LOLO5 vario part. Deviation was about +/- 0,1m/s. All in all I would sum up-very good device. [continue]

Crowded

Roman Vojtěch | May 20, 2010 | F3B | 0 |

Today I fly my Tanga (Bretamodel.cz) in following configuration:

LOLO5; records altitude, voltage, flap servo (JR/Graupner Nr.6)
SPELO5; records speed (IAS-Prandtl probe), voltage, elevator servo (JR/Graupner Nr.3)
TENZO; records line tension
JETI Duplex R6 Receiver (2,4GHz)

All three devices are time synchronized, some data are seen on-line on my transmitter via JETI Duplex downlink. There isn’t too much space, is [...]

F3B Kirchheim Open 2010

Roman Vojtěch | April 28, 2010 | F3B | 0 |

Nice competition accompanied by nice weather and controlled by experienced team lead by H.P.Goelz, M.Seyfang and U.Trautwein. Very pleasant airfield background, incl. water, showers, cakes etc.

F3X Stopwatches for Android

Roman Vojtěch | April 12, 2010 | F3B | 1 |

Vitaliy Ryumshin started Android F3X (F3B, F3J and F3K) stopwatches project. It’s perhaps partly port of well-known PalmOS stopwatches from Francesco Pantano. Just look at www.f3j.net and support this project at least by comments. You can download app also from Android Market.

Transreflexive display for Jeti Duplex

Roman Vojtěch | March 19, 2010 | Workshop | 0 |

My friend Martin “Curly” Laza made for me new display for Jeti Duplex. Legibility is far better than original JetiBox; see picture bellow. Also weight 12g is very pleasing. I have plan for specific use, stay tuned.

JetiBox modification

Roman Vojtěch | February 28, 2010 | Workshop | 0 |

JetiBox from Czech company Jetimodel is used as control/display terminal for theirs 2.4GHz Duplex system. Terminal itself is a bit big and just calls for modification. My friend Tomas Humpolec made such simple JetiBox tweek. I found following advantages:

modified JetiBox is smaller and lighter
we used different buttons, they are more reliable and comfortable
I can keep [...]

How to fine tune your airplain using LOLO5 analysis?

Roman Vojtěch | January 3, 2010 | Others | 0 |

Starting right now there is available new generation LOLO5 recorder. Step by step I’m adding some examples from real life. Now you can read about flap servo record and how to understand it.

Marry Christmas...

Roman Vojtěch | December 23, 2009 | Others | 0 |

My best wishes with comming holidays to all of you.

Roman Vojtech

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